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Support for Schnorr signatures and integration in SignatureCheckers (BIP 340)

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This enables the schnorrsig module in libsecp256k1, adds the relevant types
and functions to src/pubkey, as well as in higher-level `SignatureChecker`
classes. The (verification side of the) BIP340 test vectors is also added.
This commit is contained in:
Pieter Wuille 2020-09-11 14:33:30 -07:00
parent 5de246ca81
commit 0664f5fe1f
14 changed files with 165 additions and 13 deletions
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18
src/test/fuzz/script_sigcache.cpp
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@ -35,11 +35,19 @@ void test_one_input(const std::vector<uint8_t>& buffer)
const bool store = fuzzed_data_provider.ConsumeBool();
PrecomputedTransactionData tx_data;
CachingTransactionSignatureChecker caching_transaction_signature_checker{mutable_transaction ? &tx : nullptr, n_in, amount, store, tx_data};
const std::optional<CPubKey> pub_key = ConsumeDeserializable<CPubKey>(fuzzed_data_provider);
if (pub_key) {
const std::vector<uint8_t> random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider);
if (!random_bytes.empty()) {
(void)caching_transaction_signature_checker.VerifyECDSASignature(random_bytes, *pub_key, ConsumeUInt256(fuzzed_data_provider));
if (fuzzed_data_provider.ConsumeBool()) {
const auto random_bytes = fuzzed_data_provider.ConsumeBytes<unsigned char>(64);
const XOnlyPubKey pub_key(ConsumeUInt256(fuzzed_data_provider));
if (random_bytes.size() == 64) {
(void)caching_transaction_signature_checker.VerifySchnorrSignature(random_bytes, pub_key, ConsumeUInt256(fuzzed_data_provider));
}
} else {
const auto random_bytes = ConsumeRandomLengthByteVector(fuzzed_data_provider);
const auto pub_key = ConsumeDeserializable<CPubKey>(fuzzed_data_provider);
if (pub_key) {
if (!random_bytes.empty()) {
(void)caching_transaction_signature_checker.VerifyECDSASignature(random_bytes, *pub_key, ConsumeUInt256(fuzzed_data_provider));
}
}
}
}